udisks: split to udisks1 (stays default) and udisks2
libgphoto2: update and add libxml2
gvfs: add globally, lightWeight by default

HeavyWeight will be fixed after gnome3 from x-updates.
xfce: ./support/ not needed anymore
fix udisks2 paths
gvfs: allow gvfs-network to access it's gconf schemas

gvfs-network fails to start until it stores some setting in Gconf (memory
backend is used by default). Unfortunately, it needs schemas for to work
correctly. By default, glib searches for schemas in /usr/share/glib-2.0/schemas
OR under GSETTINGS_SCHEMA_DIR. This patch sets this variable to let gvfs
find it's precious.
Merge pull request #441 from ierton/udisks2-xfce

udisks2 for xfce